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As others said, there is plenty of 3D software. I have on the other hand only seen it done with Rhino 3D. Probably because it can import many file types (screw templates, hinges), is very quick in contructing with somewhat simple shapes, can combine surfaces and volume models and adding dimensions is rather easy. All this is probably doable with other software too (especially AutoCAD) but it seems designers favor it for it's simplicity and because it is easy to learn the software.

Many furniture makers use Sketchup which is a free software that used to be owned by Google. There is a strong community with interest in the woodworking world. Sketchup has an easy to learn interface and will get you producing working designs pretty quickly. Most 3d software is time consuming to learn and expensive to acquire. Check out the forums at sketchucation.com to learn more.

Usability is the key - possibly more than completness of functions. Some design packages offer so much it's hard to grasp it all. A 2D layout or design actually accomplished as Microsoft Word drawing or Paint image can be better than no design at all (sometimes :) ) One reviewer of CAD packages wrote in a woodworking magazine: "Basic test of a product is if I can draw a line. Most of the times that test fails". So answer the question" "Can I actually use the software to accomplsih what I need?"